Systematic velocity drifts of methanol masers associated with G9.62+0.20E-Reference-Cited by-同舟云学术

Systematic velocity drifts of methanol masers associated with G9.62+0.20E

Published:2020-11-10 Issue:3 Volume:500 Page:3425-3437
ISSN:0035-8711
Container-title:Monthly Notices of the Royal Astronomical Society
language:en
Short-container-title:

Author:

MacLeod G C¹²,Chibueze J O³⁴,Sanna A⁵⁶,Paulsen J D⁷,Houde M¹^ORCID,van den Heever S P²,Goedhart S⁸^ORCID

Affiliation:

1. The University of Western Ontario, 1151 Richmond Street. London, ON N6A 3K7, Canada

2. Hartebeesthoek Radio Astronomy Observatory, PO Box 443, Krugersdorp 1741, South Africa

3. Centre for Space Research, North-West University, Potchefstroom 2520, South Africa

4. Department of Physics and Astronomy, Faculty of Physical Sciences, University of Nigeria, Carver Building, 1 University Road, Nsukka, 410001, Nigeria

5. INAF, Instituto di Radioastronomia & Italian ALMA Regional Centre, Via P. Gobetti 101, I-40129 Bologna, Italy

6. INAF, Osservatorio Astronomico di Cagliari, via della Scienza 5, I-09047 Selargius (CA), Italy

7. Trinity House High School, 1 Falls Rd, Little Falls, Roodepoort, 1724, South Africa

8. South African Radio Astronomy Observatory, The Park, Park Road, Pinelands, 2 Fir Street, Black River Park, Observatory 7925, South Africa

Abstract

ABSTRACT The source G9.62+0.20E surprises again! Several of the associated 6.7- and 12.2-GHz methanol masers are experiencing contemporaneous and systematic velocity drifts. Both 6.7- and 12.2-GHz methanol features blueward of v = +1.2 km s−1 are blue shifting while those redward are red shifting. A best-fitting rotating Keplerian disc with a central mass of ∼12 M⊙, radii Rinner = 5 au and Router = 5000 au, and at an inclination angle of 22○ either precessing and/or experiencing infall explains these systematic velocity drifts. Also three more distinct 6.7-GHz methanol maser features are found to vary periodically; two very weak and one obviously periodic only after 2003. Evidence of periodicity is seen as early as 1992. Time lags are confirmed but the cause is unclear. It is possible this source will surprise again.

Funder

National Research Foundation

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Link

http://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/staa3467/34245826/staa3467.pdf

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